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Factors influencing temporal variation of a Sargassum filipendula (Phaeophyta: Fucales) bed in a subtropical shore

Published online by Cambridge University Press:  03 March 2009

G.B. Jacobucci ,
M.O. Tanaka  and
F.P.P. Leite
G.B. Jacobucci*
Affiliation:
Instituto de Biologia, Universidade Federal de Uberlândia, 38402-902, Uberlândia, MG, Brazil Instituto Costa Brasilis—Desenvolvimento Sócio Ambiental, Caixa Postal 32, 11680-970, Ubatuba, SP, Brazil
M.O. Tanaka
Affiliation:
Departamento de Hidrobiologia, Universidade Federal de São Carlos, 13565-905, São Carlos, SP, Brazil
F.P.P. Leite
Affiliation:
Departamento de Zoologia, Instituto de Biologia, Universidade Estadual de Campinas, 13083-970, Campinas, SP, Brazil
*
Correspondence should be addressed to: G.B. Jacobucci, Instituto de Biologia, Universidade Federal de Uberlândia, 38402-902, Uberlândia, MG, Brazil email: [email protected]
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Abstract

In the present study, we evaluate the influence of biotic and abiotic factors on temporal fluctuations of Sargassum filipendula in a subtropical shore. Monthly algal samples, abiotic components, amphipod grazer density, and epiphyte biomass were obtained from a Sargassum bed in south-eastern Brazil. Density of S. filipendula fronds decreased during the sampling period, whereas dry mass was more constant, although with a noticeable reduction in the warmer months. Hypnea musciformis was the most frequent epiphyte on S. filipendula, occurring in all sampling periods, although with significant temporal variation. Sargassum filipendula density and dry mass were both influenced by epiphyte dry mass, temperature, and amphipod grazers. Sargassum filipendula biomass negatively influenced total epiphyte biomass, whereas H. musciformis biomass was positively influenced by phosphate, nitrite, and S. filipendula density and negatively influenced by S. filipendula dry mass and amphipod grazer abundance. Algal temporal fluctuations can be related to local abiotic and biotic factors, but the variation observed for S. filipendula and its epiphytes suggest that these factors have quite distinct effects for these algae.

Keywords

temporal variationSargassum filipendulasubtropical shoresouth-eastern Brazil
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 89 , Issue 2 , March 2009 , pp. 315 - 321
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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